M8330F not starting up

My HP M8330F isnt starting up, I unplugged everything and and held down the power button for 5 seconds like HP troubleshooting reccommended but still no luck. Once I plug in the power cord the fan spins and LED light around the power button lights up for a few seconds and shuts down and not matter what i do it doesnt startup. I am stuck right now with it and have no idea what to do. The specs are 2.2 AMD 9500 phenom processor, 3Gb ram, Nvidia Gforce 8500GT, and 640 ram.

Here is a link to additional infohttp://h10025.www1.hp.com/ewfrf/wc/document?docname=c01312600&lc=en&cc=ch&dlc=de&product=3644705&lang=de

Re: M8330F not starting up

Unplug the PC and open it up. Clean out all the dust. Carefully remove and replace all the cables going to the motherboard one at a time. Do the same for the memory dimms and the video and sound cards if you have any. Plug your PC back in a give it a go.